Best Cold Brew Ratio for Concentrate

By Coffee Ratio Calculator Guru · Updated January 2025 · 5 min read

The best cold brew concentrate ratio is 1:4 to 1:5 — 1 gram of coffee for every 4–5 grams of cold water. Use our cold brew ratio calculator to get the exact water volume for any coffee amount. Concentrate is designed to be diluted 1:1 before drinking, which makes it more flexible and space-efficient than ready-to-drink cold brew.

Concentrate vs Ready-to-Drink: Which Ratio Do You Need?

Cold brew concentrate uses a 1:4 to 1:6 ratio and is stored undiluted. When you want a cup, you dilute it with water, milk, or ice at roughly 1:1. Ready-to-drink cold brew uses a 1:8 to 1:12 ratio and can be poured directly from the fridge. Concentrate has two advantages: it stores in a smaller container, and you can adjust the final strength each time by varying how much you dilute it. The trade-off is the extra step of dilution every time you serve it.

Steep Time for Cold Brew Concentrate

Cold brew concentrate needs slightly less steep time than ready-to-drink cold brew because the higher coffee concentration means less water per gram of coffee — extraction happens somewhat faster even at cold temperatures. In the refrigerator at 4°C, a 1:4 to 1:5 concentrate needs 12–16 hours. At room temperature (18–22°C), reduce this to 8–12 hours. Check at the low end of the range first — over-steeped concentrate becomes astringent and loses its characteristic smooth sweetness.

How to Dilute Cold Brew Concentrate

Start with a 1:1 dilution (equal parts concentrate and water or milk) as your baseline. From there, adjust to taste: more water for a lighter drink, less for a stronger one. Cold brew concentrate mixed 1:1 with milk produces a drink similar in strength to an iced latte. Mixed 1:2 or 1:3 with water produces a lighter, more refreshing drink perfect for hot days. The flexibility is one of the best features of concentrate brewing.